Consequences of Jamaican Iguana Extinction: Ecosystem Collapse Risk

The Jamaican iguana (*Cyclura collei*) is a **critically endangered keystone species** endemic to the Hellshire Hills. Its extinction would trigger cascading ecological collapse:

1. Seed Dispersal Failure

Iguanas are primary **large-fruit seed dispersers** for native trees (e.g., *Ficus*, *Spondias*, *Cordia*). Without them, seed shadows shrink, regeneration fails, forest composition shifts toward wind-dispersed/invasive species.

2. Plant Diversity Loss

Reduced recruitment of key canopy trees → lower floral diversity → reduced food/habitat for birds, bats, insects, other reptiles.

3. Nutrient Cycling Disruption

Iguana feces concentrate nutrients (nitrogen, phosphorus) in nesting/foraging areas, creating fertility hotspots. Loss degrades soil fertility patches.

4. Microhabitat Loss

Iguanas excavate **nest burrows** used by **Jamaican boa, lizards, frogs, invertebrates** as refuges. Burrow loss = secondary extinctions.

5. Trophic Cascade

Iguanas are prey for **Jamaican boa, red-tailed hawk, mongoose (invasive)**. Their loss alters predator dynamics, potentially increasing predation on other natives.

6. Forest Structure Change

Long-term: closed canopy → open woodland/scrub. Altered microclimate, fire regime, carbon storage. Potential **ecosystem state shift**.

Conservation Status

Rediscovered 1990 after presumed extinct. Intensive **head-starting, predator control (mongoose/feral cats), habitat protection** by UWI, NRCA, IIF, SDZWA. Population ~300–500. **Extinction is preventable but requires sustained funding and invasive species eradication.**